Fuel distributing system



March 27, 1934. A. M. HUNT FUEL'DISTRIBUTING SYSTEI Filed Sept. 25, 1931ifa/efeaea T TOR NE Y.

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Patented Mar. 27, 1934 UNI-reo srmssg FUEL DISTRBU'ING SYSTEM Andrew M.Hunt, deceased, late of Berkeiey, Calif., by Crocker First Federal TrustCompany, San

Francisco, Calif., executor, assigner to The Standard Stoker feinpany,Incorporated, a corporation of Delaware Application September 555,19:31, Serial No. 585,251

' s claims. (ci. irc-iep This invention relates to stokers of thescatter feed type wherein fuel is discharged over a rc bed by a pressurefluid blast and has for its ol,- ject the provision of a new andimproved fuel distributing system and more particularly to a Cal new andimproved firing table for separating the line from the coarse fuel andseparately distributing each over the frebed.

They present invention provides an improved system of distributing fuelwherein the coarse and fine fuel are separated and each is separatelydischarged over the rebed by blasts of different intensities which maybe controlled and regulated to meet the varying conditions of firing.Numerous attempts have heretofore been made to separate coarse and nefuel with various degrees of success or failure. The present inE ventioncontemplates the' use of an improved firing table in the form of ahollow casting, the

-- top wall of which is provided with a riddle permitting fine fuel todrop therethrough and coarse fuel -to passA thereover, and thebottoniwall of which is provided with means for evacuating the hollowVfiring table thereby drawing ne fuel through the riddle and effecting acomplete separation from the coarse fuel, and discharging theflne fuelthrough openings provided in the front wall of the firing table.

The invention further consists in the parts and the arrangement of theparte as will be hereinafter described and as illustrated in theaccompanying drawing, in which Eig. 1 is a vertical section of a portionof a furnace and a Stoker therefor, showing the in vention in` positiontherein;

Fig. 2 is a detail plan section on of vFig. l;

Fig. 3 is an end view of the stolzer and firing table taken through thefiring opening from within the Firebox; and

Fig. 4 is a section on the line 14 of Fig. 2.

The invention is illustrated and described as applied to a locomotive,but it will be apparent that the invention is equally applicable tofurthe une 2-2 haces of other types wherein the invention may CII beused to advantage. Y

A portion of a locomotive. boiler rebox is shown at l() and is providedwith the backwall lllhaving a firing opening 12 therethrough. Theiirebox grates are shown at 13.

1 The i vention is applicable to various types of stckers and only somuch of the stoker as is necessary to an understanding of the inventionhas been illustrated. The portion of the Stoker u shown-comprises ariser conduit 14 rigidly supported from the baclwall 1l by `a bracket15. kA y conveyor screw 16 advances the fuel through the riser 14 to thefiring opening where it is received on a ring table 17 which will bedescribed in detail further on in the description.

The riser conduit i4 is provided with .a removable cover section i3,which may be hinged at f upper end providing access to the interiorriser conduit. The fuel delivered by the riser conduit 14 is on the ringtable 17 from whence it proies -d into the fircbox. The firing table 17is pref bly, but not necessarily, in the form of an i egral castingprovided with the une fuel cir-.einher 19 and comprising top and bottomwalls 20 and 2l respectively, and front and rear 'walls 23 respectively.The firing table 17 is securely fastened to the depending flange 2li oi'the forward wall of the riser conduit 14 through rear wall 23 bysuitable means, asby the bolts 25.

The rearward portion 26 of the top wall 20 is offset in a slightlyhigher plane from the forward portion 27 of the top wall 20. A steamchamber 28 is formed in the' top wall 20 at the offset between theforward and rearward portions of the top wall 2G. The rearward portion26 of the firing table top wall 20 is apertured. forming a riddle 29 forseparating the une fuel from the coarse fuel. The coarse fuel is urgedforwardly across the rearward portion 26 of the firing table top wall2i) by the impelling action of the screw 16 onto the forward portion 27from where it is distributed over thefire by a pressure fluid blastissuing from the chamber 28 through the jet openings 30. The forwardside portions of the forward portion 27 of the `firing table 20 areprovided with the pockets 31, which serve to receive and direct aportion of the coarse fuel to the rear corners of the rebox.

The front wall 22 of theiiring table 17 is prou vided with a pluralityof fine fuel discharge openings in diameter at the outside than at theinside in order to make them self clearing. A steam charn-- ber 33 isformed in the bottom wall 21 intermediatethe front and rear walls of thefiring table 27. The forward face of the steam chamber 33 is providedwith a plurality of jet openings 34 in alignment with the openings 32,whereby a blast of pressure fluid is discharged from the chamber 33through the jet openings 34 and the fuel discharge openings 32 creatinga vacuum inside thel firing table 27 drawing the fine fuel through theriddle 29 and discharging it through the openings 32 over the firebeneath the path of the coarse fuel.

Preferably, the blast issuing from the jet openings 30 of the tcp wallof the firing table is more powerful than the lower blast issuing fromthe jet openings 34, this arrangement being desirable because the highpressure blast distributes the Ylump fuel, whereas, the lower blastscatters the finer particles of fuel which do not require the same forcefor distribution over the fire. The

32, which are preferably slightly larger v upper blast also serves as acover or blanket for the lower blast, preventing to a considerableextent the loss of ne fuel normally discharged through the stackunconsumed because of the heavy draft during operation of thelocomotive.

The chamber 28 receives pressure fluid from a suitable source of supplythrough the supply pipes and the chamber 33 receives pressure fluidthrough the supply pipe 36.

What is claimed is:

1. In a fuel distributing system for scattering fuel in aerial pathsover a fire, a chambered firing table having top, bottom and frontwalls, means for delivering fuel to said top wall, riddling means in therearward portion of said top wall whereby fine fuel drops through saidriddling means onto said bottom wall and coarse fuel passes thereover,pressure fluid blast means forward of said riddling means for projectingthe coarse fuel forwardly across the forward portion of said top wall,fine fuel discharge openings in the front wall of said chambered firingtable, and means arranged tc evacuate said chambered ring tableentraining fine fuel laden air through said riddle and discharging itacross said bottom wall and through said fine fuel discharge openings.

2. In a fuel distributing system for scattering fuel in aerial pathsover a fire, an approximately rectangular hollow firing table includinga top, bottom and front wall, means for delivering fuel to the top wallof said firing table, riddling means in the rearward portion of said topwall whereby fine fuel drops through said riddling means onto saidbottom wall and coarse fuel passes thereover,

pressure fluid blast means in said top wall forward of said riddlingmeans for distributing the coarse fuel, a plurality of openings in thefront wall of said hollow firing table a pressure fluid -blast means insaid bottom wall arranged to issue through said openings in the frontwall of said firing table creating a suction entraining fine fuel ladenair through said riddling means and discharging it through the openingsin said firing table front wall.

3. n a fuel distributing system for scattering fuel in aerial paths overa fire, a cored firing table comprising a top wall having a pressurefluid chamber formed therein intermediate its forward and rearwardedges, a bottom wall having a pressure fluid chamber formed therein anda front wall, means for delivering fuel to the top wall of said firingtable, perforations in the rearward portion of said top wall formingriddling means whereby fine fuel drops through said riddling means ontosaid bottom wall and coarse fuel passes thereover, nc fuel dischargeopenings in the front wall of said ring table, a series of forwardlydirected jets communicating with the pressure fluid chamber in said topwall for distributing coarse fuel and a series of forwardly directedjets communicating with the pressure Huid chamber in said bottom wallarranged to evacuate the cored portion of said firing table entrainingfine fuel laden air through said riddling means and discharging itthrough the openings in said firing table front wall.

4. In a fuel distributing system for scattering fuel in aerial pathsover a re, a cored firing table comprising a top wall having a pressureiiuid chamber formed therein intermediate its forward and rearwardedges, a bottom wall having a pressure iiuid chamber formed thereinintermediate its forward and rearward edges and a front wall, saidpressure iiuid chambers and those portions of the top and bottom wallsrearward thereof being raised with respect to the forward portions ofsaid 'top and bottom walls respectively, the rearward portion of saidtop wall being formed as a riddle for separating fine fuel from coarsefuel, the fine fuel dropping through said riddle onto said bottom walland coarse fuel passing over said riddle, a series of jets communicatingwith the pressure iiuid chamber in said top wall for issu ing a blastacross the forward portion of said top wall for distributing the coarsefuel, pockets formed in the forward side portions of said top wall fordeiiecting a portion of the coarse fuel laterally, a series of openingsin the front wall of said firing table, a series of jets communicatingwith the pressure iiuid chamber in said bottom wall for issuing a blastacross the forward portion of said bottom wall through said openings insaid front wall whereby suction is created in said cored portion of saidfiring table entraining fine fuel laden air through said riddle andprojecting it forwardly across the forward portion of said bottom wall.

5. As a new article of manufacture a firing table in the form of aunitary member comprising top, bottoni, front, rear and sidewallsenclosing a cavity, pressure fluid chambers formed in said top and saidbottom walls, respectively, intermediate said front and rear walls,openings in the front wall of said firing table communicat ing with saidcavity, a series of jets communicating with the pressure fluid chamberin said top wall and directed across the forward portion of said topwall, a series of jets communicating with' the pressure fluid chamber insaid bottom wall and directed across the forward portion of said bottomwall and a plurality of perforations in the rear portion of said firingtable top wall forming a riddle, said riddle being spaced apart from thebottom wall of said firing table.

6. As a new article of manufacture a firing table in the form of aunitary member comprising top, bottom, rear, front and sidewallsenclosing a cavity, pressure fluid chambers formed in said top wall andsaid bottom wall respectively intermediate said front and rear walls,said pressure fluid chambers and the rearward portion of L said top andbottom walls being raised with respect to the forward portion of saidtop and bottom walls respectively, a plurality of perforations in therearward portion of said top wall forming a riddle, said riddle beingspaced apart from the bottom wall of said firing table, a series of jetscommunicating with the pressure fluid chamber in said top wall directedacross the forward portion 'of said top wall, a series of jetscommunicating with the pressure fluid chamber in said bottom wall anddirected across the forward portion of said bottom wall and a pluralityof openings in the lower portion of the ring table front wall inalignment with the jets in said bottom wall pressure fluid chamber.

[1.. s.l CROCKER FIRST FEDERAL TRUST COMPANY, By E. F. LAWRENCE,

Assistant Trust Olicer, Ezrecator of the Last Will and Testament ofAndrew M. Hunt, Deceased.

